Trace Cu Doping Enabled High Rate and Long Cycle Life Sodium Iron Phosphate Cathode for Sodium-Ion Batteries
Nanjing University of Science and Technology · Nanjing University of Aeronautics and Astronautics · +1 more institution
Abstract
Na4Fe3(PO4)2(P2O7) (NFPP) is currently receiving a lot of attention, as it combines the advantages of NaFePO4 and Na2FeP2O7 in terms of cost, energy density, and cycle stability. However, the issues of intrinsic poor electronic conductivity and difficult high-purity preparation may impede its practical application. Herein, the pivotal role of Cu doping in strengthening the polyanion structure and improving its electrochemical properties is comprehensively investigated. It is found that trace Cu doping not only expands the lattice volume of NFPP but also suppresses the formation of the inactive NaFePO4 impurity phase. In addition, Cu doping can effectively reduce the structural variations of NFPP during…
Citation impact
- FWCI
- 35.27
- Percentile
- 100%
- References
- 39
Authors
14Topics & keywords
- Doping
- Materials science
- Anode
- Impurity
- Cathode
- Ion
- Nanotechnology
- Electrode